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 | Acesso ao texto completo restrito à biblioteca da Embrapa Amazônia Oriental. Para informações adicionais entre em contato com cpatu.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
28/01/2016 |
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Data da última atualização: |
26/05/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
HAMMEL, B.; VOLLET-NETO, A.; MENEZES, C.; NASCIMENTO, F. S.; ENGELS, W.; GRÜTER, C. |
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Afiliação: |
Benedikt Hammel, USP / University of Tübingen; Ayrton Vollet-Neto, USP; CRISTIANO MENEZES, CPATU; Fabio S. Nascimento, USP; Wolf Engels, USP / University of Tübingen; Christoph Grüter, USP / University of Lausanne. |
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Título: |
Soldiers in a stingless bee: work rate and task repertoire suggest they are an elite force. |
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Ano de publicação: |
2016 |
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Fonte/Imprenta: |
The American Naturalist, v. 187, n. 1, p. 120-129, Jan. 2016. |
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DOI: |
10.1086/684192 |
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Idioma: |
Inglês |
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Conteúdo: |
The differentiation of workers into morphological subcastes (e.g., soldiers) represents an important evolutionary transition and is thought to improve division of labor in social insects. Soldiers occur in many ant and termite species, where they make up a small proportion of the workforce. A common assumption of worker caste evolution is that soldiers are behavioral specialists. Here, we report the first test of the ?rare specialist? hypothesis in a eusocial bee. Colonies of the stingless bee Tetragonisca angustula are defended by a small group of morphologically differentiated soldiers. Contrary to the rare specialist hypothesis, we found that soldiers worked more (+34%?41%) and performed a greater variety of tasks (+23%?34%) than other workers, particularly early in life. Our results suggest a ?rare elite? function of soldiers in T. angustula, that is, that they perform a disproportionately large amount of the work. Division of labor was based on a combination of temporal and physical castes, but soldiers transitioned faster from one task to the next. We discuss why the rare specialist assumption might not hold in species with a moderate degree of worker differentiation. |
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Palavras-Chave: |
Abelha do ferrão; Divisão do trabalho; Meliponicultura. |
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Categoria do assunto: |
O Insetos e Entomologia |
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Marc: |
LEADER 01876naa a2200229 a 4500
001 2035542
005 2022-05-26
008 2016 bl uuuu u00u1 u #d
024 7 $a10.1086/684192$2DOI
100 1 $aHAMMEL, B.
245 $aSoldiers in a stingless bee$bwork rate and task repertoire suggest they are an elite force.$h[electronic resource]
260 $c2016
520 $aThe differentiation of workers into morphological subcastes (e.g., soldiers) represents an important evolutionary transition and is thought to improve division of labor in social insects. Soldiers occur in many ant and termite species, where they make up a small proportion of the workforce. A common assumption of worker caste evolution is that soldiers are behavioral specialists. Here, we report the first test of the ?rare specialist? hypothesis in a eusocial bee. Colonies of the stingless bee Tetragonisca angustula are defended by a small group of morphologically differentiated soldiers. Contrary to the rare specialist hypothesis, we found that soldiers worked more (+34%?41%) and performed a greater variety of tasks (+23%?34%) than other workers, particularly early in life. Our results suggest a ?rare elite? function of soldiers in T. angustula, that is, that they perform a disproportionately large amount of the work. Division of labor was based on a combination of temporal and physical castes, but soldiers transitioned faster from one task to the next. We discuss why the rare specialist assumption might not hold in species with a moderate degree of worker differentiation.
653 $aAbelha do ferrão
653 $aDivisão do trabalho
653 $aMeliponicultura
700 1 $aVOLLET-NETO, A.
700 1 $aMENEZES, C.
700 1 $aNASCIMENTO, F. S.
700 1 $aENGELS, W.
700 1 $aGRÜTER, C.
773 $tThe American Naturalist$gv. 187, n. 1, p. 120-129, Jan. 2016.
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Registro original: |
Embrapa Amazônia Oriental (CPATU) |
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Registro Completo
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Biblioteca(s): |
Embrapa Semiárido. |
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Data corrente: |
18/02/2021 |
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Data da última atualização: |
18/02/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 2 |
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Autoria: |
PEREIRA, G. A.; SANTOS, E. M.; OLIVEIRA, J. S. de; ARAUJO, G. G. L. de; PAULINO, R. de S.; PERAZZO, A. F.; RAMOS, J. P. de F.; CÉSAR NETO, J. M.; CEUZ, G. F. de L.; LEITE, G. M. |
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Afiliação: |
Gildênia Araújo Pereira; Edson Mauro Santos; Juliana Silva de Oliveira; GHERMAN GARCIA LEAL DE ARAUJO, CPATSA; Raniere de Sá Paulino; Alexandre Fernandes Perazzo; João Paulo de Farias Ramos; José Maria César Neto; Gabriel Ferreira de Lima Cruz; GUILHERME MEDEIROS LEITE. |
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Título: |
Intake, nutrient digestibility, nitrogen balance, and microbial protein synthesis in sheep fed spineless-cactus silage and fresh spineless cactus. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Small Ruminant Research, v. 194, 2021. |
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Idioma: |
Português |
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Conteúdo: |
An experiment was carried out to compare the use of fresh cactus with cactus ensiled with and without a microbial inoculant in sheep diets by examining their feed intake, nutrient digestibility, nitrogen balance, and microbial protein synthesis and counting fecal enterobacteria. Twenty uncastrated mixed-breed sheep at approximately six months of age, with an average initial weight of 23.48 ± 2.40 kg, were used in the study. The animals were assigned to four treatments [fresh spineless cactus processed twice daily at the time of supply (FC2); fresh spineless cactus processed only once, in the morning, and supplied twice daily (FC1); spinelesscactus silage without inoculant (CS); and spineless-cactus silage with microbial inoculant (CSI)] in a completely randomized design with five replications per treatment. The experimental period was 21 days. The use of spineless cactus in the form of silage (CS and CSI) resulted in higher (P < 0.05) intakes of dry matter, organic matter, neutral detergent fiber, ether extract, non-fibrous carbohydrates, and total digestible nutrients; and higher digestibility coefficients of dry matter, organic matter, and total digestible nutrients. Lower counts of fecal enterobacteria were also observed with the ensiled cactus. By contrast, the diets did not influence (P> 0.05) nitrogen balance, microbial efficiency, urinary nitrogen losses, or fecal nitrogen losses. Regardless of inoculation, the ensiling of spineless cactus improves the sanitary quality of the diet, reducing the amount of enterobacteria in the cactus and resulting mainly in improved nutrient intake by sheep. MenosAn experiment was carried out to compare the use of fresh cactus with cactus ensiled with and without a microbial inoculant in sheep diets by examining their feed intake, nutrient digestibility, nitrogen balance, and microbial protein synthesis and counting fecal enterobacteria. Twenty uncastrated mixed-breed sheep at approximately six months of age, with an average initial weight of 23.48 ± 2.40 kg, were used in the study. The animals were assigned to four treatments [fresh spineless cactus processed twice daily at the time of supply (FC2); fresh spineless cactus processed only once, in the morning, and supplied twice daily (FC1); spinelesscactus silage without inoculant (CS); and spineless-cactus silage with microbial inoculant (CSI)] in a completely randomized design with five replications per treatment. The experimental period was 21 days. The use of spineless cactus in the form of silage (CS and CSI) resulted in higher (P < 0.05) intakes of dry matter, organic matter, neutral detergent fiber, ether extract, non-fibrous carbohydrates, and total digestible nutrients; and higher digestibility coefficients of dry matter, organic matter, and total digestible nutrients. Lower counts of fecal enterobacteria were also observed with the ensiled cactus. By contrast, the diets did not influence (P> 0.05) nitrogen balance, microbial efficiency, urinary nitrogen losses, or fecal nitrogen losses. Regardless of inoculation, the ensiling of spineless cactus improves the sanitary qualit... Mostrar Tudo |
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Palavras-Chave: |
Digestibilidade de nutrientes; Palma forrageira ensilada; Palma forrageira verde. |
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Thesagro: |
Caprino; Dieta; Digestibilidade; Inoculante; Nutrição Animal; Ovino; Palma Forrageira; Proteína Microbiana. |
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Thesaurus NAL: |
Food animals; Opuntia; Silage; Silage fermentation. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/221258/1/Intake-nutrient-digestibility-nitrogen-balance-2020.pdf
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Marc: |
LEADER 02830naa a2200409 a 4500
001 2130083
005 2021-02-18
008 2021 bl uuuu u00u1 u #d
100 1 $aPEREIRA, G. A.
245 $aIntake, nutrient digestibility, nitrogen balance, and microbial protein synthesis in sheep fed spineless-cactus silage and fresh spineless cactus.$h[electronic resource]
260 $c2021
520 $aAn experiment was carried out to compare the use of fresh cactus with cactus ensiled with and without a microbial inoculant in sheep diets by examining their feed intake, nutrient digestibility, nitrogen balance, and microbial protein synthesis and counting fecal enterobacteria. Twenty uncastrated mixed-breed sheep at approximately six months of age, with an average initial weight of 23.48 ± 2.40 kg, were used in the study. The animals were assigned to four treatments [fresh spineless cactus processed twice daily at the time of supply (FC2); fresh spineless cactus processed only once, in the morning, and supplied twice daily (FC1); spinelesscactus silage without inoculant (CS); and spineless-cactus silage with microbial inoculant (CSI)] in a completely randomized design with five replications per treatment. The experimental period was 21 days. The use of spineless cactus in the form of silage (CS and CSI) resulted in higher (P < 0.05) intakes of dry matter, organic matter, neutral detergent fiber, ether extract, non-fibrous carbohydrates, and total digestible nutrients; and higher digestibility coefficients of dry matter, organic matter, and total digestible nutrients. Lower counts of fecal enterobacteria were also observed with the ensiled cactus. By contrast, the diets did not influence (P> 0.05) nitrogen balance, microbial efficiency, urinary nitrogen losses, or fecal nitrogen losses. Regardless of inoculation, the ensiling of spineless cactus improves the sanitary quality of the diet, reducing the amount of enterobacteria in the cactus and resulting mainly in improved nutrient intake by sheep.
650 $aFood animals
650 $aOpuntia
650 $aSilage
650 $aSilage fermentation
650 $aCaprino
650 $aDieta
650 $aDigestibilidade
650 $aInoculante
650 $aNutrição Animal
650 $aOvino
650 $aPalma Forrageira
650 $aProteína Microbiana
653 $aDigestibilidade de nutrientes
653 $aPalma forrageira ensilada
653 $aPalma forrageira verde
700 1 $aSANTOS, E. M.
700 1 $aOLIVEIRA, J. S. de
700 1 $aARAUJO, G. G. L. de
700 1 $aPAULINO, R. de S.
700 1 $aPERAZZO, A. F.
700 1 $aRAMOS, J. P. de F.
700 1 $aCÉSAR NETO, J. M.
700 1 $aCEUZ, G. F. de L.
700 1 $aLEITE, G. M.
773 $tSmall Ruminant Research$gv. 194, 2021.
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